<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card style="margin-top:30px">
            <!-- 警告区-->
            <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable=false show-icon >
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat-opt">
                <el-col>
                    <span>商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <!-- options :指定数据源-->
                    <!-- props :用来指定配置对象-->
                    <!-- model :选中的父级分类的Id数组-->
                    <!-- change :当选中改变时触发的事件-->
                    <!-- clearable :清空选择-->
                    <el-cascader
                            expand-trigger="hover"
                            v-model="selectedCateKeys"
                            :options="cateList"
                            :props="cateProps"
                            @change="handleChange"
                            clearable
                    >
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加 动态参数 面板-->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini"
                               :disabled="isBtnDisable"
                               @click="addDialogVisible = true"
                    >添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand"></el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="values"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="">
                                <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加 静态属性 面板-->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini"
                               :disabled="isBtnDisable"
                               @click="addDialogVisible = true"
                    >添加属性
                    </el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand"></el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="values"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="">
                                <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框框 -->
        <el-dialog
                :title="'添加'+titleText"
                :visible.sync="addDialogVisible"
                width="50%"
                @close="addDialogClosed"
        >
            <!-- 添加参数对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="values">
                    <el-input v-model="addForm.values"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
 
<script>
    export default {
        name: "Params",
        data() {
            return {
                /* 商品分类列表 */
                cateList: [],
                /* 级联选择框配置对象*/
                cateProps: {
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'
                },
                /* 级联选择框双向绑定到数组*/
                selectedCateKeys: [],
                // 被激活页签的名称
                activeName: 'many',
                // 动态参数的数据
                manyTableData: [],
                // 静态参数的数据
                onlyTableData: [],
                // 控制添加对话框的显示和隐藏
                addDialogVisible: false,
                // 添加参数表单数据对象
                addForm: {
                    attr_name: ''
                },
                // 添加表达验证规则对象
                addFormRules: {
                    attr_name: [
                        {required: true, message: '请输入参数名称', trigger: 'blur'}
                    ]
                }
 
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            // 获取所有商品分类列表
            async getCateList() {
                const {data: res} = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品分类失败')
                }
                this.cateList = res.data
            },
            // 级联选择框选中项变化，会触发这个函数
            handleChange() {
                this.getParamList()
            },
            // tab 页签点击事件的处理函数
            handleTabClick() {
                this.getParamList()
            },
            // 获得参数列表数据
            async getParamList() {
                // 证明选中的不是三级分类
                if (this.selectedCateKeys.length !== 3) {
                    this.selectedCateKeys = []
                    return
                }
                // 根据所选分类的id和当前所选的面板，获取对应的参数
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {
                        sel: this.activeName
                    }
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品参数列表失败')
                }
                console.log(res.data)
                if (this.activeName === 'many') {
                    this.manyTableData = res.data
                } else {
                    this.onlyTableData = res.data
                }
            },
            // 对话框的关闭事件监听
            addDialogClosed() {
                this.$refs.addFormRef.resetFields()
            },
            // 点击按钮，添加参数
            addParams() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) return
                    const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    })
                    if (res.meta.status !== 201) {
                        return this.$message.error('添加商品参数列表')
                    }
                    this.$message.success('添加商品参数成功')
                    this.addDialogVisible = false
                    this.getParamList()
                })
            }
 
        },
        computed: {
            // 如果按钮需要被禁用，返回true
            isBtnDisable() {
                if (this.selectedCateKeys.length !== 3) {
                    return true
                } else {
                    return false
                }
            },
            // 当前选中的三级分类的Id
            cateId() {
                if (this.selectedCateKeys.length === 3) {
                    return this.selectedCateKeys[2]
                }
                return null
            },
            // 动态计算标题文本
            titleText() {
                if (this.activeName === 'many') {
                    return '动态参数'
                } else {
                    return '静态属性'
                }
            }
        }
    }
</script>
 
<style scoped>
    .cat-opt {
        margin: 15px 0;
    }
</style>